Photographic shutter



Jail. 27. 1925. 1,524,081

7 c. BORNMANN PHOTOGRAPHI C' SHUTTER Filed Sept. 2, 1922 :aaa s INVENTOR[(725 6 CARL EOENMANN @1 7 A ORNEY Patented Jan. 27, 1925.

UNITED STATES, PATENT OFFICE.

CARL BORNMANN, OF BINGH AMTON, NEW YORK, ASSIGNOR TO ANSCO PHOTOPROD-UC'I'S, INCL, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

PHOTOGRAPHIC SHUTTER.

Application filed September 2, 1922. Serial No. 586,001.

To all whom it may concern. which passes over an aperture 6 in the base,Be it known that I, CARL BORNMANma upon oscillation of said shutterplate, thus citizen of the United States, and a resident permittinglight to enter the camera for the of the city of Binghamton, county ofpurpose of making an exposure in a well Broome, and State of New York,have in-- known and familiar manner. vented a new and useful Improvementin Pivoted. on a pin 7 on the base 1 is a shut- Photogiu hic Shutters,of which the followter actuating lever 8. It is to be noted that ing isa diescription, reference being had to the pivot pin 7 is in the path ofmovement the accompanying drawings, in which like of the shutter plate 3for a purpose to be reference numerals indicate like parts. described.An upstanding lug 9 is struck The principal object of my invention isfrom the base, and extends upwardly through to provide 'a cushion stopfor the shutter a'slot 10 in the lever 8, whereby the lever plate of aphotographic camera. Heretofore 8 is limited in its movement by saidlug. rigid stops have been used for this purpose, The inner end of thelever 8 carries an anand have proven very unsatisfactory due to chor pin11 to which one end of the spring the rebound given the shutter plate.This 12 is attached, the other end of said, spring rebound frequentlycauses the shutter plate being secured to an upstanding lug 13 struck tofly back far enough touncover the lens from the base at one edge of theaperture and thus destroy the exposure which has 5. 14 designates a lugstruck up at the edge just been made. of the shutter plate, centrallythereof, which A further object is to provide a. single stop lugcooperates with the time exposure member which. operates in the samemanner lever (not shown) in a well known manner. upon the shutter platein either of its two The shutter plate 3 is spaced from the basepositions, thus eliminating unnecessary ma- 1 by any suitable means asby a spring washterial and labor. or or by an indentation struck in saidplate A third object is to utilize the pivot pin 3 around the pivotthereof. of the shutter operating lever in providing The operation oftheparts just described the shutter stop, the advantages of which isfamiliar to those skilled in the art and will readily appear. needs nodetailed description. When the Other objects and advantages in detailslever 8 is swung on its pivot in either diof construction and operationwill appear rection, the spring 12 acts to throw the 'as the descriptionproceeds.

My invention is an improvement over U. S. Patent Number1,185,283-granted to C. Bornmann and E C. Clark May 30, 1916.

In the drawings: i

Figures 1 and 2 are plan views of the complete shutter showing theshutter plate in its two positions of rest.

Figure 3 is a side view of the shutter as shown in Figure 1. 1 V

Figures 4 and 5 are enlarged details showing the action of the shutterplate on the cushion stop. 7

Figure 6 is a detail.

In the drawings, 1 indicates the base plate of the shutter which issecured in any suitable manner to the shutter board of the camera (notshown). Pivoted at 2 u n this base, substantially centrally thereo is ashutter plate 3 of semicircular configuration, having rounded shoulders.thereon for a purpose hereinafter described. The shuta quick snapmovement, during which movement the apertures 5 and 6 coincide and admitlight as described.

Mounted upon the pivot 7 and resting on'the base 1 is a circular washer15. The opening 16 in said washer which fits over the pin 7 is largerthan said pin, permittmg a horizontal sliding movement relative thereto.During such movement said washer slides frictionally on the base 1.

Also mounted on the pivot pin 7 and resting on the'washer 15 is a spring17. In the form shown, this spring isa circular spring washer, althoughit is to be understood that other types of springs may be used, for1nstance a coil spring. The spring 17 bears against the underside of theactuating lever 8 and is tensioned thereby, thus holding the washer 15frictionally against the base. This arrangement of parts comprises thecushion stop for the shutter plate and provldes a very shutter plate 3to its opposite position with ter plate 3 is provided with an aperture 5eflicient means for gradually stopping said shutter plate and preventingrebound thereof.

The operation of the device is as follows: \Vhen the lever 8 is swung onits pivot, the shutter plate 3 is snapped with considerable force fromone position, shown in Fig. 1, to the other, shown in Fig. 2. One of therounded edges 4 of said plate, depending upon the direction of movementof the plate, strikes the washer 15 near the limit of movement of saidplate. The spring 17 permits the washer 15 to frictionally slide on thebase until the edge of the opening 16 comes in contact with the springpin 7 thus stopping the plate.

It will be seen that I have provided a simple, yet eflicient stop forthe shutter plate, which gradually stops the plate at the limit of itsmovement ineither direction, thus avoiding the detrimental rebound,common where rigid stops are used.

-While the embodiment illustrated and herein described is the preferredform of my invention, it is to be understood that the same issusceptible to various changes in details of construction and parts andI do not therefore limit myself to the exact form as shown other than bythe appended claims.

I claim:

1. In a photographic shutter comprising in combination a movable shutterplate, a manually operated pivoted lever for actuating said plate, thepivot of said lever being in the path of movement of said shutter platewhereby said plate is limited in its movement-1 2. In a photographicshutter comprising in combination a movable shutter plate, pivoted meansfor actuating said plate, the pivot of said means being in the path ofmovement of said shutter plate, and means on said pivot for graduallystopping said plate in its movement in either direction.

3. In a photographic shutter comprising in combination a base, a movable,shutter plate, pivoted actuating means therefor, the pivot of saidmeans being in the path of movement of said shutter plate, and frictionmeans on said pivot, slidable .on said base, I

for gradually stopping said plate in its movement in either direction.

4. In a photographic shutter comprising in combination a movable,shutter plate,

pivoted actuating means therefor, the pivot of said means being in-thepath of movement of said shutter plate, and friction means on saidpivot-comprising a spring controlled washer, for gradually stopping saidplate in its movement in either direction.

In a photographic shutter comprising in combination a movable shutterplate, a pivoted actuating lever therefor, the pivot of said lever beingin the path of movement of said shutter plate, a circular washer mountedon said pivot the opening of which is larger than said pivot, and aspring between said washer and said lever whereby the plate will begradually stopped at the limit of its movement in either direction byengagement with said washer.

6. In a photographic shutter comprising in combination with a movableshutter plate and pivoted actuating means therefor, a yielding stop forsald plate frictionally mounted on the pivot of said actuating means forsliding movement thereon.

7. In a photographic shutter comprising said washer and said actuatingmeans.

' CARL BORNMANN.

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